Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6fbc86429233a7…

MALICIOUS

PDF

60.0 KB Created: 2020-09-02 22:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c7e46e30bf7f2fccc54edd5c27c2ac SHA-1: 25d0f6045a363f91bd4c7635f932d62d2ac58670 SHA-256: ea6fbc86429233a7ee33cfb231ac1fc2125bb158b3afb6ecf48bc8265c605cfe
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.link, which is likely used to deliver a secondary payload. The document also functions as a link farm, directing users to numerous other PDFs hosted on cdn.shopify.com and static.usrfiles.com, potentially for SEO poisoning or to spread further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=brachial+plexus+palsy+pdf
    • https://static.usrfiles.com/ugd/4bdc6d_5c59b9d5cb0b4eba96f3c45ebe3a1642.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cc338a1055e4ffd9ff26b337e21962f.pdf
    • https://static.usrfiles.com/ugd/f8de3e_bb4c5fd52b80410eac5414c44782d1bc.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_db23162b14c54612a1e92a2b101ae184.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_2e03d65429a74569959040367b147fca.pdf
    • https://static.usrfiles.com/ugd/a64c8c_c45324d269174c2cb7ba205a135c988d.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/pafonitafur.pdf
    • https://cdn.shopify.com/s/files/1/0433/8938/6901/files/bcdedit_exe_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/vezapeduseki.pdf
    • https://cdn.shopify.com/s/files/1/0429/2562/1404/files/30499923266.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/pezegetewafijegopomopi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9469/files/20602830602.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/tisoberu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad44.bin
1d763b1ddfa05432d3312efffbc872e9333b93af05beec7a7c20fbb58a91b08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD44 5460 bytes
font_01_sfnt_off0000bfdd.bin
8dfddba4b1cae5f30a3fc7731646a471313b3082eaef8f9f4b3fc5de98806ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 10404 bytes

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